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From Viktor Jevdokimov <Viktor.Jevdoki...@adform.com>
Subject RE: tombstones problem with 1.0.8
Date Fri, 23 Mar 2012 13:11:56 GMT
Should not.

Scenario 1, write & delete in one memtable
T1 write column
T2 delete row
T3 flush memtable, sstable 1 contains empty row tombstone
T4 row tombstone expires
T5 compaction/cleanup, row disappears from sstable 2

Scenario 2, write & delete different sstables
T1 write column
T2 flush memtable, sstable 1 contains row with column
T3 delete row
T4 flush memtable, sstable 2 contains empty row tombstone
T5 row tombstone expires
T6 compaction, rows from sstable 1 & 2 merged, not saved to sstable 3

Scenario 3, alive tombstone
T1 write column
T2 flush memtable, sstable 1 contains row with column
T3 delete row
T4 flush memtable, sstable 2 contains empty row tombstone
T5 delete row (present in memtable)
T6 row tombstone for T3 expected to be expired
T7 compaction, sstable 3 row tombstone appears because of T5




Best regards/ Pagarbiai

Viktor Jevdokimov
Senior Developer

Email: Viktor.Jevdokimov@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453

J. Jasinskio 16C,
LT-01112 Vilnius,
Lithuania



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and any copies.-----Original Message-----
From: Radim Kolar [mailto:hsn@filez.com]
Sent: Friday, March 23, 2012 13:28
To: user@cassandra.apache.org
Subject: Re: tombstones problem with 1.0.8

Example:

T1 < T2 < T3

at T1 write column
at T2 delete row

at T3 > tombstone expiration do compact ( T1 + T2  ) and drop expired tombstone

column from T1 will be alive again?

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